after WWII service in Germany with a Magnetophon K4 machine. Mullin, a technician with Army Signal Corps, returned to the U.S. Modern tapes have moved on to improved substrate materials such as PEN polyethylene naphthalate (similar to PET) and aramid (aromatic polyamide, a totally different Kevlar-like material). In the late 1930s, polyvinyl chloride (PVC) emerged as the preferred base material for recording tape until replaced in the 1950s by "mylar" (biaxially-oriented polyethylene terephthalate - BoPET) substrates from DuPont and others. With superior sound quality and significantly lower cost than competing steel-tape designs, the K4 model introduced in 1938 became AEG’s first commercially successful machine. The Magnetophon K1 recorder and Type C tape debuted at the Berlin Radio Show in August 1935. AEG designed a recording machine and worked with BASF, Ludwigshafen to develop a cellulose acetate-based tape to replace the fragile paper. He received a patent in 1928 for his “sound paper machine” that he licensed to AEG, Berlin. He did not pursue it commercially.Īustro-German engineer Fritz Pfleumer (1881 – 1945) coated 16 mm wide paper strips with fine granules of iron powder as a medium for magnetic recording. O'Neill of New York, NY patented “a strip of paper or other cheap material on which is deposited a trail or line of magnetic material, such as metal particles, dust or fine shavings” for reproducing sound.
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